Last time I checked (and it’s been a few months), GOG hadn’t updated their version of FO4 with the “next-gen” update that came out early this year. That may be a good thing or a bad thing depending on your perspective because supposedly the update breaks a lot of mods but also is supposed to increase performance.
Did you get a huge flood of emails at the start? That happened to me one time and it was because one of my old passwords got leaked. Buried within the flood of emails was a legit “your password has been changed” email for an account.